Apparatus for molding the sections of electrical conduits



(No Model.) 6'Sheets-Sheet 1. D. H. DORSETT, J. E. MORRIS & B. WILLIAMS.APPARATUS FOR MOLDING THE SECTIONS OF ELECTRICAL CONDUITS' No. 291,996.Patented Jan. 15, I884.

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D. H. DORSETT', J. E. MORRIS & B. WILLIAMS. APPARATUS FOR MOLDING TEESECTIONS OF ELECTRICAL GONDUITS.

No. 291,996. Patented Jan. 15,1884.

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(No Model. 6 Sheets-SheeE 3. D. H. DORSETT, J. E. MORRIS & B. WILLIAMS.APPARATUS FOR MOLDING THE SEGTiONS OF ELECTRICAL 'OONDUITS.

Patented Jan. 15, 1884:.

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D. H. DORSETT, J. E. MORRIS & B. WILLIAMS. APPARATUS FOR MOLDING THESECTIONS OF ELEOTRIGAL OONDUITS.

No. 291,996. Patented Jan. 15, 1884.

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1). H. DORSETT, J. E. MORRIS & .B. WILLIAMS. A APPARATUS FOR MOLDING THESECTIONS OF ELECTRICAL GONDUITS.

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D. H. DORSETT, J. E. MORRIS 85 B. WILLIAMS. APPARATUS'FOR MOLDING THESECTIONS OF ELECTRICAL OONDUITS.

Patented Jan. 15,1884.

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DANlEL II. DORSETT, J OSEPII E. MORRIS, AND BENEZETTE "WILLIAMS, OF

CHICAGO,

ILLINOIS.

SPECIFICATION forming part of Letters Patent No. 291,996, dated January15, 1884;.

Application filed April 21, 1883. (No model.)

To all whom it HULK/0011106777,:

Be it known that we, DANIEL H. DORSETT, JOSEPH E. Monnis, and BunnznrrnWIL- LIAMS, citizens of the United States, residing at Chicago, in thecounty of Cook and State of Illinois, have invented certain new anduseful Improvements in the Apparatus for Molding the Sections forElectrical Conduits, of which the following is a specification, to wit:

This invention relates to an improvement in apparatus for molding thesections of electrical conduits; and it consists in the combination,with a hollow base forming a steamchamber, and surmounted by a casing ormold having hollow walls and steam-connections, of a chambered head orfollower carrying series of pipes forming cores, and adapted to beraised or lowered at will, substantially as will be hereinafter morefully set forth.

In order to enable others skilled in? the art to which our inventionappertains to make and use the same, we will now proceed to describe itsconstruction and operation, referring to the accompanying drawings, inwhich- Figure 1 is a side elevation of our invention; Fig. an enlargedside view of the hollow base; Fig. 3, a central vertical section, andFig. 4 a plan view, of the same. Fig. 5 is a side elevation of the uppersteam-chamber; Fig. 6, a bottom view, and Fig. 7 a central section, ofthe same; Fig. 8, a side view, and Fig. 9 across-section of thebell-former; Fig. 10, a vertical section of the outer mold, and Fig. 11a horizontal section of the same; Fig. 12, a plan view of thecore-centering devices; Fig. 13, a vertical section of the same. andFig. 14 an enlarged cross-section of one of the steampipes and itsexpanding shell.

Arepresents the base of the machine,which consists of a hollow chamberprovided with an opening or connection, a, for steam or water pipes, andrecessed or socketed in its upper side, which recess is divided from thechamber by a web of metal, a, in which is formed a suitable number ofsockets, a", and adapted to receive any suitable packing, and providedwith screw-nipples A, as shown by Fig. 8. These nipples are made hollow,and

the web a is perforated below the packingchamber, as represented.

Upon the upper side of the base A is set a base-plate, A, alsoperforated, to correspond with the nipples A and perforations a, in theble height to inclose all the working parts of the apparatus.

The main or outer former or mold, O, is formed in two parts, and has aflaring bell-shaped flange, G, at its upper end, adapted to formasimilar bell upon the end of a section of the conduit similar to thatused upon ordinary sewer or gas mains for the reception of the smallerend of the next section. Each portion of the mold Gis provided with asteam-jacket, 0 having openings 0 at top and bottom, for connection withthe supply and exhaust pipes, and the space between the inner and outerwalls of the steanrspace is provided with horizontal ribs 0, havingopenings at alternate ends, in order that steam or water admitted at thetop may be caused to circulate around the mold in a zigzag courseand'escape at the bottom. The two parts of the mold are each providedupon one side with lugs 0 which are hinged between similar lugs, 12,upon the angleiron frame B. Upon the opposite edges these parts areformed, one with perforated lugs c and the other with a perforatedtongue, 0, which, when the parts are brought together, passes betweenthe lugs upon the opposite part, and are securely fastened by awedgekey, 0, as shown in the drawings.

D represents the upper steam-chamber, hav ing its lower face formed withperforations (1, corresponding in number and position With the openingsin the base or lower chamber.

fn these perforations are secured long tubes )1 steam-pipes D, whichserve as cores for 'orming the cellular conduit-sections. This :hamberis provided or formed with wings D, iaving vertical tongues (1 upontheir outer aids, adapted to slide vertically between guides 1 securedto the uprights B of the main frame, md is also provided with a steam orwater 3011116Ci-1011, d", and an eye, (2", by which the lead and itscore-tubes are raised and lowered )y means of a tackle secured to anyconvenent place above the apparatus or to the upper )art of the frame.

Upon the core-tubes D, below the head, is )laced the bell-former orcore, consisting of a :up-shaped casting, E, provided with a num- )er ofshort guide-tubes, E, soeketed into the )ottom of the cup through whichthe core ubes pass. This casting or cup is supported .nd raised andlowered into proper position y means of rods 6 e, secured to the cup andiassing upward through openings in the steamiead, asshown by Fig. 1, andprovided with ,ny suitable hoisting device at their upper nds.

Around the cup E is a ring, E, formed with .n annular shoulder, 6, nearits lower edge, s clearly seen in Figs. 8 and 9, and formed with twoarms, 6 upon opposite sides, adaptd to rest upon the upper edge of themain cold or outer shell, and also with small inner houlders, eflwhichrest upon the cup E and :eep the ring in proper place.

Across the upper side of the bell-former E l" is placed a bar, E,secured to the arms f the ring in such a position as to pass freely'(BhWQGl'l the core-tubes,and serving as a handle y which the ring maybe lifted independent t' the cup, or the two pressed down within he moldupon the material under operation. This bar is adapted to slide betweenand be 'uided by the uprights B of the frame upon ach side, and isprovided with guidelugs e, which serve to keep it from being twisted orrom turning or twisting the bell-former.

In operation, the upper and lower steamhambers and the two parts of themain mold ieing connected with supply and exhaust iipes,(preferablyfiexible pipes, )the main mold 3 closed and locked. Thebell-former is now awered until the ring catches and rests upon he outershell of the mold, and the cup coninues until it is at the bottom of themold. .he head with its pipes being lowered at the ame time, thecup-casting E and its guideubes center the lower ends of the core-tubes),-and guide them through the openings in he base-plate. They then passdown through he nipples and packing-boxes into the lower teanrchamber,where they are held by securng the head or its hoisting device. Thebellormer is now raised until far enough above he top 'of the mold toallow of easy access hereto, and the material of which-the section to beformed is poured in in a heated and iquid or plastic state. Steam,having been adl mitted to the upper steam-chamber or follower, passesdown through the core tubes into the lower chamber or base and offthrough the exhaust-connection, thereby keeping the interior of the massof plastic material well heated, and prevents its setting or coolinguntil the mold is entirely filled and the casting finished. Steam is atthe same time admitted to the upper end of the jacketed mold, and,circulating around the divisions, as described, escapes at the lower endfor the same purpose. \Vhen the mold has been filled as far as the bell,the former E is dropped into place and the bell filled, and the sectionis then formed. The steam is now turned oft of both mold and core pipes,and a stream of cold water passed through them,which soon sets or coolsthe material. The follower and bell-former are then lifted, and if thematerial should adhere to the core-tubes, it may readily be loosened bya current of steam sufficient to slightly heat and loosen them. Theouter mold is then unlocked and thrown open, and the section or castingtaken out and set aside, and the operation is repeated.

In some instances and with some compounds the application of thesteanrjets may not be sufficient to loosen the core-tubes, and inthiscase we use the device shown in Figs. 12, 13, and 14. This consistsof a series of tubes, G, formed of sheet metal,ha ving its verticaledges overlapping, as shown by Fig. 14. These sheet-metal casings areplaced with their lower ends in sockets g in the upper part of theperforations of the base-plate, and their upper ends are centered andheld in position by two rack-frames, G, the arms of which cross eachother at right angles, and are secured by pins 9 at their corners. Thecore-tubes descending through these sheet-metal casings expand them totheir proper form and hold them in place while the racks or centeringdevices are withdrawn. After the casting is made the coretubes areeasily withdrawn,and the sheetmetal casings then spring together and arereadily removed without the necessity of using any steam or heat.

This device is especially adapted for the manufacture ofconduit-sections of the kind and material for which we havean-application for a patent now pendingthat is, of

an asphaltum compound; but it is evident that it may be used for othermaterials, and also that, if desired, the core-tubes may be dispensedwith and solid rods used in their place, dispensing at the same timewith the upper and lower steam -chambers, and, if wished,with thesteamjacket also; but we prefor to use the device as herein described.

It will be observed that the peculiar shape of the shouldered ring E andits position upon the bell-former E forms the interior of the bell ofthe conduit-section with two interior annular shoulders. When thesmaller end of a section is inserted in the bell of another, its endrests against the inner of these shoulders,

joint in a perfectly solid manner.

leaving a space between this and the solid por- I tion of the secondsection, while the first is held in proper position to have its cellsregister with those of the second by the outer shoulder, and beyond thisthere will be an annular space between the two sections. The small endof each section is also formed with a number of short longitudinaldepressions by the projections a upon the base-plate A. WVhen thesections are laid, the end one is inserted in the bell of the other, asdescribed, and the two are firmly cemented together, as described in ourformer application, before referred to, by pouring melted or liquidmaterial into the space between the two sections through a hole in theside of the bell, formed by a core-lug upon the inside of the outermold, thus forming the two sections into one continuous conduit. Theannular space around the outer end part of the joint is then filled withplastic material, which penetrates the depressions formed bythe'baseplate and completes the Having thus fully described ourinvention, what we claim as new, and desire to secure by Letters Patent,is

1. In an apparatus for casting cellular sections for undergroundelectrical conduits, a vertically-sliding hollow or chambered headhaving an opening for the admission of steam or water, and provided withhollow cell-cores depending from its lower side, in combination with aperforated base-plate through which the cores are passed, substantiallyas shown and described.

2. In an apparatus for castingsections for underground electricalconduits, a base-plate upon which the section is cast, formed orprovidedwith projections around its periphery, adapted to formlongitudinal depressions in the end of the casting, substantially as andfor the purpose set forth.

3. In an apparatus for casting cellular sections for undergroundelectrical conduits, a hollow or chambered base having an escapeopeningfor water or steam, and a series of openings provided withstuffing-boxes, in combination with a series of hollow core-tubesadapted to pass through the stuffing-boxes and open into the hollowbase, substantially as shown and described.

4. In an apparatus for casting sections for underground electricalconduits, the hollow base A, having its upper side chambered out, andprovided with holes 64 having nipples A in them, and provided with anoutlet, a, for steam and water, in combination with the base-plate A",recessed within the base, but projecting somewhat above it, and havingopenings corresponding to the nipples in the base and projections aaround its periphery, substantially as and for the purpose set forth.

5. In an apparatus for casting sections for underground electricalconduits, an outer mold formed in two parts, hinged to the main frame,and each part provided with a jacket or casing having inlet and outletpassages for steam or water, substantially as described and shown.

6. In an apparatus for cast-ing sections for underground electricalconduits, an outer mold provided with ajacket or casing having inlet andoutlet passages for steam or water, and a series of diversions betweenthe mold and its jacket, having openings in alternate ends, whereby thesteam or water is caused to circulate around the mold in its passage,substantially as shown and described.

7. In an apparatus for casting cellular sections for undergroundelectrical conduits, the combination, with a mold and its base, and aseries of cell-cores, of a bell-former through which the said cores arepassed, and adapted to be dropped to the bottom of the mold when desiredto clean or center the cores, substantially as described and shown.

8. In an apparatus for casting cellular sections for electricalconduits, a bell-former constructed in two independent parts, one withinthe other, the outer of which is adapted to form two annular shouldersupon the inner side of the cast section, substantially as shown anddescribed.

9. In an apparatus for forming cellular sections for undergroundelectrical conduits, the bell-former E, having holes or tubes E, adaptedto slide upon the cell-cores, and supported by the rods 6 e, incombination with the shouldered ring E having the arms 6 and shoulderse, and the handle or bar E, substantially as and for the purpose setforth.

10. In an apparatus for casting cellular sec tions for undergroundelectrical conduits, the combination, with a base having uprights uponeach side, and a two-part mold hinged thereto, of a head adapted toslide vertically in said uprights, and having cell-cores dependingtherefrom, and provided with means for raising and lowering it,substantially as shown and described.

11. In an apparatus for forming cellular sections for undergroundelectrical conduits, a casing for the cell-cores, formed of sheet metal,and adapted to fit closely around said cores when they are in the mold,but capable of being sprung together for removal, substantially asdescribed and shown.

12. In an apparatus for forming cellular sections for undergroundelectrical conduits, the combination of a series of open sheet-metalcasings, adapted to fit around the cell-cores, with a base-plate formedwith a series of socketed or shouldered openings, and a centering devicecomposed of two racks or frames adapted to hold the casings in positionwhile the cores are being lowered, substantially as described and shown.

13. An apparatus for casting cellular sections for undergroundelectrical conduits, conarranged to operate substantially as and for thepurpose set forth.

In testimony whereof We affix our signatures in presence of twoWitnesses.

DANIEL I-I. DORSETT.

JOSEPH E. MORRIS. BENEZETTE \VILLIAMS.

Witnesses:

J. E. STEVENSON, FRANK JOHNSON.

